From 50f3c3efdd5773d90396be07a7ecaa58227ff906 Mon Sep 17 00:00:00 2001
From: Joe Thornber <ejt@redhat.com>
Date: Fri, 13 Jun 2014 13:57:09 +0100
Subject: [PATCH] dm thin: switch to an atomic_t for tracking pending new block
 preparations

Previously we used separate boolean values to track quiescing and
copying actions.  By switching to an atomic_t we can support blocks that
need a partial copy and partial zero.

Signed-off-by: Joe Thornber <ejt@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
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